A neutron crystal-field study of the copper isotope effect on the pseudogap in the high-T-c cuprate HoBa2Cu4O8статья
Статья опубликована в высокорейтинговом журнале
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Аннотация:The copper isotope effect on the relaxation rate of crystal-field transitions in the slightly underdoped high-temperature superconductor HoBa2Cu4O8 has been investigated by means of inelastic neutron scattering. The measurements give clear evidence for the opening of a normal stare pseudogap ar T* far above T-c, but it is shifted from T*=160(10) K for the HoBa2 (Cu4O8)-Cu-63 compound to T*=185(5) K for the (HoBa2Cu4O8)-Cu-65 compound, giving rise to an isotope effect of DeltaT*=25(15) K. (C) 2001 Elsevier Science B.V. All rights reserved.